Nope, it's not that either. Even with instant turret rotation, they're still somewhat inaccurate, and I made sure to target the center of the hitbox.
1. This is intentional. My reasoning was that player could theoretically chain a bunch of them together in a line and use them as faster conveyors, which was undesirable, although I never tested whether this "exploit" was actually viable. I guess I should enable it now?